fox 15 and Jr. Flight Streak

Is a Fox .15 enough to make the Jr. Flight Streak a good flier, or should I go for a .19. Will a Fox .15 keep it out on 52 foot lines.

Andy, I fly a full size Flite streak with an Enya 19 on 52' lines so I would say a 15 on a jr. would work. Somebody will probly prove me wrong.

I fly a Jr Flight Streak with slant head Fox .15 with 8X6 prop on 52 ft lines.

>Andy, I fly a full size Flite streak with an Enya 19 on 52'
>lines so I would say a 15 on a jr. would work. Somebody will
>probly prove me wrong.

No one will prove you wrong. The Fox 15 will provide quite lively performance for that plane. It actually can use a little less power. I've been using modern 09/10 sized motors on these old 15 sized planes and believe that a good Norvel 074 would do as well if weight is carefully watched.
I probably should say that if you have an OK Cub 15/19 and use it you will probably not be overpowered. Somehow I still have an affinity for these somewhat dubious powerplants.
dennis

>>Andy, I fly a full size Flite streak with an Enya 19 on 52'
>>lines so I would say a 15 on a jr. would work. Somebody will
>>probly prove me wrong.
>
>
>
>No one will prove you wrong. The Fox 15 will provide quite
>lively performance for that plane. It actually can use a
>little less power. I've been using modern 09/10 sized motors
>on these old 15 sized planes and believe that a good Norvel
>074 would do as well if weight is carefully watched.
>I probably should say that if you have an OK Cub 15/19 and
>use it you will probably not be overpowered. Somehow I still
>have an affinity for these somewhat dubious powerplants.
>dennis
??????????????????????????????????????????????????????????????
What do you think my OK Cub 29 would pull? A Trixter Barnstormer?

-Snip-

>What do you think my OK Cub 29 would pull? A Trixter
>Barnstormer?

Hi Phil, actually Yes! I've seen Barnstomers fly very well with an O&R .23.
Those .23 powered models weighed between 23-25 oz's; build very light.

I've flown a FS Jr. with the Fox .15 slant plug, worked quite well on '52 X .012 lines. Used an 8x4 prop and a Perfect 2oz wedge tank. I taught my son and a few other folks to fly C/L with this set-up.

>Is a Fox .15 enough to make the Jr. Flight Streak a good
>flier, or should I go for a .19. Will a Fox .15 keep it out
>on 52 foot lines.

Hi Andy, I have a FS Jr that has had various engines for power.
All of them have been .09's, and all are diesels.from strongest to
weakest: Paw .09 contest, CS .09(Webra clone), and a pitifully weak
Frog .09 reed valve.(approx HP of Cox Black Widow). I flew the FS Jr
on 52'x.012" lines. If your Fox .15 is one of the older,and most importantly
lighter versions,it will fly great. It will fly just like a regular Flight Streak.
The Jr flys best when powered with 4oz's or lighter engines.

LAST EDITED ON Oct-01-06 AT 05:31 AM (CST)
 
I presently fly a Peacemaker (same as Jr Flitestreak) with a PAW 2.49 and a 9x4 prop. It is certainly fast enough and plenty of line tension on 52' lines. On an 8x6 it was TOO ##### fast for pleasant flying.

I've flown countless numbers of these planes, always with a .15 - Cox Olympic (nice!) Rossi 15D (Fast!) Oliver Tiger, AM-25.

I'd say the Fox 15 would be ideal, but maybe with an 8x4 or 9x4 to get plenty of traction and not too much speed.

Incidentally, make sure the CG is in the right place. Too far forward and it won't handle, too far back and you loose line tension and it becomes VERY tricky to fly.

Thanks everyone, you have help greatly.

LAST EDITED ON Oct-01-06 AT 11:23 AM (CST)
 
>I presently fly a Peacemaker (same as Jr Flitestreak) with a
>PAW 2.49 and a 9x4 prop. It is certainly fast enough and
>plenty of line tension on 52' lines. On an 8x6 it was TOO
>##### fast for pleasant flying.
>
>I've flown countless numbers of these planes, always with a
>.15 - Cox Olympic (nice!) Rossi 15D (Fast!) Oliver Tiger,
>AM-25.
>
>I'd say the Fox 15 would be ideal, but maybe with an 8x4 or
>9x4 to get plenty of traction and not too much speed.
>
>Incidentally, make sure the CG is in the right place. Too
>far forward and it won't handle, too far back and you loose
>line tension and it becomes VERY tricky to fly.
>
>Charles

Peacemaker is NOT the same as a Jr FS. It is a tad larger and GMA designed it as a combo Stunt/Combat model for the UK market where (at the time) most modelers were using dielsels (somewhat larger and heavier than a comparable glow). Original Jr FS used a Fox .15 steelfin as I recall (per GMA). He used to fly full size Flite Streaks on the Ollie Tiger .15.

There is a NIB Norvel .15 BB on Ebay.

Andy has an engine

>There is a NIB Norvel .15 BB on Ebay.

John, nice engine I guess, but not really for the Jr. It's nice for a
full sized Flight Streak. The Jr flys best with light(4oz's or less)
engines. Because,it's only got 230sq"s of wing area. which is why
I chose .09 diesels for my FS Jr. I suspect the Norvel .061 would
fly the Jr very well also.

Let me put it to you like this, a Fox .15 on a Sterling P-38 with one engine out will still fly the airplane (it doesn't slow down much either!) quite easily despite all the dead weight and drag.

You don't specify which Fox 15. I built the TF Jr Flite Streak when I was in high school and stuck a Fox 15X slant head on it. Used a wooden TF 8-4 prop and no landing gear.

I don't recall if I used .012" x 45' or longer lines but the combo flew well. Well enough for me to learn inverted flight with it.

The Fox 15X was a little cantakerous to start compared with modern schnuerle 15s but it ran steadily and provided ample power despite it's 3.5oz weight.

>You don't specify which Fox 15. I built the TF Jr Flite
>Streak when I was in high school and stuck a Fox 15X slant
>head on it. Used a wooden TF 8-4 prop and no landing gear.
>
>I don't recall if I used .012" x 45' or longer lines but the
>combo flew well. Well enough for me to learn inverted
>flight with it.
>
>The Fox 15X was a little cantakerous to start compared with
>modern schnuerle 15s but it ran steadily and provided ample
>power despite it's 3.5oz weight.

They can be a little bit of a pain depending on the individual specimen. It is all a question of fits (get a lot of those myself of late!) and fuel and handling, etc.
They can run very well and are light, so if you have a decent one it will serve you well. It just "all depends"...

Andy,
As others have mentioned, it depends on which Fox 15 you are talking about. I use a "modern" Fox15BB on a full-size Top Flite Streak Arf, (which by the way is a very light plane). I am flying it on 52 foot lines.

Don't use a Fox .15 that has been hurled..

LAST EDITED ON Oct-02-06 AT 09:35 AM (CST)
 
Just to reiterate what others have said here...the Streak Jr and the Fox 15 are a fine match. I currently have two set up this way, one with the First Generation Steel Fin version (the one that George Aldrich liked for its 4-2-4 stunt run capabilites), and another with a Slant Fin Second Gen version. Both fly well.

I don't make much of a distinction between the two motors, frankly. Like many SSWers here, I have a number of these little engines, and most run fine, but a few hardly will run at all. There is more variation (within sample variance, as the stat people like to say) within a model type, and between them (between sample variation).

A 9-4 is too much for the little Fox. 8-4 is right for stunt applications; in fact, the Fox instructions tell you to use an 8-4. If you are racing someone for beers or something, I suppose a 7-6 would be the way to go...These engines want to rev, and they would like at least 15% nitro, usually.

Bottom line: If you find a Fox 15 of any persuasion (Steel Fin, Fox 15X, the elusive 15XX, or the ultra rare 15XXX, or even an RC conversion) that starts and runs reasonably well, hang on to it, and treat it well.

I have four engines. Two of the older type and two slant plug types.
All four will start within 2-3 flips and always have. You are right..
they do like the nitro..

Yes. Think of Fox 15s as 1/2As...Nitro needy, and very prop sensitive.

I used to own a Jnr Flite Streak with a Thunder Tiger 15 and a 7x4 prop and it flew beautifully on 52' lines even with no nitro. A 7x6 or 8x4 prop would also go well but a bit slower.

I now have a 42" Flite Streak with an OS Max 20 and use an 8x6 prop and it goes great and pulls really hard on 60' lines. A really nice well balanced plane and a great performer.

LAST EDITED ON Oct-03-06 AT 11:57 AM (CST)
 
What length of engine run (Fox .15 steelfin or Fox .15 slant plug engine) do you get with a two ounce tank of fuel? I have both engines, but expect to use the steelfin.

I am completing a Top Flite Jr. Flite Streak kit manufactured in 1962 and and need to decide on either a Brodak 2 ounce standard tank or a Perfect 1 1/3 ounce tank. I am leaning toward the two ounce tank. (Other information: Hot Fireball short plug, 8/4 Master Airscrew prop, 10% nitro/29% Taffinder fuel, 52 foot .012 control lines.)

I have a jr ringmaster with a fox 15 and I use a Brodak 2oz. tank.
I have never timed the run but I can assure you it is long enough.
I also am building a very old kit of the Jr. flite streak, yellow and black box, and plan on putting a brodak 2 oz tank on it.

Well, I just pulled out my old TF "yellow box" Jr. Flite Streak and the plans show a Fox .15 steel fin on the top view, a Torpedo .15 on the side view and two alternate noses with Fox .19/.25 and Torpedo .19 (both for which you have to notch the mount a bit).

For a tank it recommends a Froom T-23A or similar. I have no idea of the capacity of that tank.

I usually use Perfect #8 or #21 because they were available at my LHS and I still have some. I don't think either of these give enough run for a full pattern, never timed them. They DO provide enough run time for some fun!

I have powered these with various engines, including heavy 2.5 diesels (too heavy). Mt current old (TF) one has a TT .10 in it.

I find .012x52' lines work well.

Note that mufflers were not used extensively when this plane was designed. Plans show C/G on the wing spar, you may have to add tail weight.

I did not check the Brodak Jr. Flite Streak plans, they are out in the garage.

LAST EDITED ON Oct-04-06 AT 12:44 PM (CST)
 
Well, I just pulled out my old TF "yellow box" Jr. Flite Streak and the plans show a Fox .15 steel fin on the top view, a Torpedo .15 on the side view and two alternate noses with Fox .19/.25 and Torpedo .19 (both for which you have to notch the mount a bit).

George,

I have all of the engines recommended on the early "yellow box" Jr. Flite Streak plans.......Fox .15 steel fin, (Fox .15 slant plug which is not actually recommended because it was introduced later), Torpedo .15 green head, Fox .19 stunt three bolt backplate, Fox .25 stunt three bolt backplate and the Torpedo .19 green head. Since the steel fin Fox .15 version seemed to be favored, by the manufacturer, due to its location on the plans, and due to Currell's recommendation of that engine for this plane, I decided to go with the steel fin. I could, of course, try the other engines at a later time.

CG at the spar is way too far back on a Jr. Flitestreak. Check your Brodak plans. Mine, built from Brodak kit, with extended nose, balanced 3/8 (I think) in front of the plan CG and was very smooth with crisp corners. CG @ about half way between the spar and the back of the leading edge wood is close to where I think it should be.